Test equipment and power supplies · AC Power Solutions family

Agilent 6811B: troubleshooting and error codes

The ServiceForge knowledge base holds 45 documented symptoms for the Agilent 6811B, with 75 ranked causes, 139 diagnostic checks with test points and expected values, and 51 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Power-on self-test fails with ERR annunciator

ERR annunciator illuminates on display during power-on self-test sequence

Ranked causes

1. Non-volatile RAM checksum error (common)
2. RAM selftest failure (occasional)
3. DAC selftest error (occasional)
4. Voltage selftest error (occasional)
5. Current selftest error (occasional)
6. Fan voltage failure (occasional)
7. Digital I/O selftest error (rare)

First check

Query error code during self-test

Test point: *TST? command
Expected: Return value zero if all tests pass or error code of first failed test

7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inverter assembly produces no output high voltage

A7 inverter assembly not generating proper AC output; no PWM signals or gate/drain waveforms

Ranked causes

1. INV_OFF signal low preventing inverter operation (common)
2. No PWM signal from control assembly (common)
3. Power FET gate or drain waveforms abnormal (common)
4. Shorted or broken FETs on inverter assembly (occasional)

First check

Verify INV_OFF signal status

Test point: A10U1801-23
Expected: INV_OFF signal high

6 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration error or fault

Calibration command rejected or calibration data incorrect

Ranked causes

1. CAL switch in incorrect position (common)
2. CAL password incorrect (occasional)
3. CAL not enabled or calibration constants incorrect (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

External shunt line and load connections not secure or missing cable covers high voltage

Current shunt input/output cable connections are loose, incorrectly wired, or missing safety covers, exposing live line potential at barrier block terminals

Ranked causes

1. Cable covers not installed on shunt connectors after line connections (common)
2. Incorrect line/neutral/ground connection on shunt barrier block (occasional)
3. Cable connections to shunt barrier block screws not tight (common)

First check

Verify cable covers installed on shunt connectors

Test point: External shunt input and output connectors, ac source input connector
Expected: All three hooded cable covers installed and fully covering barrier block screw terminals

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

GPIB/RS-232 communication failure

Unit not responding to GPIB or RS-232 controller commands

Ranked causes

1. Missing or low +5 Vdc supply to GPIB board (common)
2. Crystal oscillator not functioning (occasional)
3. GPIB/RS-232 transceiver fault (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Measurement cable connections not secure or missing hoods high voltage

Cable connections at connector terminals are loose, improperly wired, or missing safety hoods, exposing live line potential

Ranked causes

1. Cable hoods not installed after wiring (common)
2. Wire connections not firmly tightened (common)
3. Incorrect wire gauge or routing in connector (occasional)

First check

Verify cable hoods are installed on all connectors

Test point: All connector ends (ac source end, shunt end)
Expected: Cable hoods fully covering connector terminals, snapped together

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power Analyzer input connector not operating properly high voltage

Connector plug connections not functioning correctly or frequency measurements inaccurate due to missing voltage sense inputs

Ranked causes

1. Voltage SENSE inputs not connected (common)
2. Incorrect cable routing or connection (occasional)
3. Frequency source incorrectly selected or unavailable (occasional)

First check

Verify V SENSE HI and LO connections are made

Test point: V SENSE HI and LO terminals on ac source connector
Expected: Both HI and LO connections physically present and tight

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Abnormal output waveform at A9TP500

Oscilloscope shows incorrect waveform when probed at A9TP500; expected 500mV/div, 5.00us/div

Ranked causes

1. U502 and associated circuit components defective (occasional)
2. U500 relay 501 or voltage driver resistors defective (occasional)

First check

Observe waveform at A9TP500 with oscilloscope

Test point: A9TP500
Expected: Normal waveform at 500mV/div, 5.00us/div
Tools: Oscilloscope

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Communication error between interfaces

Data communication failure between control assemblies during operation

Ranked causes

1. GPIB/DSP/Trigger assembly communication failure (common)
2. Front panel communication failure (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

DC Rail Assembly bias voltages incorrect or absent high voltage

Measured bias voltages at test points do not match expected values (+15V, -15V, +5V); backlight or control signals missing.

Ranked causes

1. A3 AC FET Assembly failure (common)
2. A5 DC Rail board component failure (common)

First check

Disconnect cable from A3 FET Board

Test point: J1042 on A4 AC Input Board
Expected: Cable disconnected from connector

7 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

FET board test and verification high voltage

Comprehensive troubleshooting of A3 FET board with power FETs Q201-204, Q211, Q222, Q233, Q244 using resistance measurements and signal testing

Ranked causes

1. Defective power FET or gate bias circuit (common)
2. Open circuit in FET gate input (occasional)

First check

Measure resistance between +Rail and common

Test point: E502 to common (-Rail)
Expected: Greater than 20 MΩ, >

15 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

GPIB/RS-232 transceiver malfunction

Board fails to communicate via GPIB or RS-232 interface

Ranked causes

1. No +5 VDC supply to L100 (common)
2. Crystal oscillator Y100 not functioning (occasional)

First check

Verify +5VDC supply voltage

Test point: L100
Expected: +5 Vdc
Tools: DMM

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Programming error or command violation

Invalid command sent or command incompatible with current settings

Ranked causes

1. List length mismatch or voltage/waveform incompatibility (common)
2. Command incompatible with current interface or configuration (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

PWM driver output not toggling high voltage

PWM driver output at U491-8 to U491-9 shows no pulse activity or incorrect pulse train; FET switches not being driven.

Ranked causes

1. 300 Vdc rail not connected or defective (common)
2. PWM driver IC or gate drive circuit failure (occasional)

First check

Verify 300 Vdc rail connection to A3 FET board

Test point: Cable from A3 FET to J1042 on A4 AC Input Board
Expected: Cable connected and secured

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

PWM Enable signal absent or incorrect high voltage

PWM_EN signal at U436-6 not present or not at expected +5V level; prevents PWM control circuit operation.

Ranked causes

1. External synchronization signal missing or incorrect (common)
2. U423 Bias Detect Circuit failure (occasional)

First check

Verify EXT_CLK_ISO signal present at U436-6

Test point: U436-6
Expected: WAVEFORM present (83 kHz external clock per Figure 4-5A)

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Remote voltage sense at location other than external shunt not functioning high voltage

Voltage sensing at a point different from the external current shunt is not measuring correctly or connections are not secure

Ranked causes

1. Original voltage sense wires not completely removed from supplied cable (common)
2. Custom sense cable connections not made at remote location (occasional)

First check

Verify voltage sense wires removed from supplied cable

Test point: Agilent supplied measurement cable connectors
Expected: No voltage sense wires present at either end of cable

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

ROM upgrade failure with OUT OF RANGE error

ROMUPD command fails showing OUT OF RANGE error, requiring re-initialization and recalibration. May occur after QA firmware or memory corruption.

Ranked causes

1. Previously initialized with QA firmware revision (occasional)
2. Non-volatile memory corruption (occasional)

First check

Verify OUT OF RANGE error

Test point: Front panel display after ROMUPD command
Expected: OUT OF RANGE error message shown

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Verify DSP and Control Assembly operation high voltage

Check analog voltages and digital signals on A8 DSP and A10 Control boards after commands entered via front panel

Ranked causes

1. Incorrect J822 analog voltage levels (unknown)
2. Offset voltage not responding to offset command (unknown)

First check

Measure J822 analog voltages with output disabled

Test point: J822 pins 1-33
Expected: J822-31: -3.8 Vdc, J822-32: -0.8 Vdc, J822-23: +1.0 Vac, J822-22: +5.0 Vdc, J822-15: -4.0 Vdc, J822-20: -15.0 Vdc, J822-13: +6.0 Vdc, J822-18: +15.0 Vdc, J822-9: -2.5 Vdc, J822-16: -1.5 Vdc, J822-5: +3.0 Vac, J822-12: -5.0 Vdc, J822-1: 0 Vac, J822-10: +6.0 Vdc, J822-8: +5.0 Vdc, J822-6: +6.0 Vdc

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Both CV and CC annunciators illuminated caution

CV (constant voltage) and CC (constant current) indicator lights both on simultaneously

Ranked causes

1. Peak current limit set too low (common)

First check

Check peak current limit setting

Test point: Peak current limit control
Expected: Limit set above normal operating current

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

CAL DENIED message on display during calibration

Display shows CAL DENIED or error code 401 appears when calibrating over GPIB

Ranked causes

1. Internal INHIBIT CAL switch has been set (common)

First check

Locate calibration switches on A8 DSP board

Test point: A8 DSP board Switches 1 and 2
Expected: Switches in Inhibit Cal position

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Current measurement using 4-terminal shunt high voltage

Connect voltmeter to current-monitoring terminals on 4-terminal current shunt to eliminate measurement error from load lead voltage drops

Ranked causes

1. Voltage drop error in load leads during current measurement (common)

First check

Verify voltmeter connected to current-monitoring terminals on 4-terminal shunt

Test point: Current shunt terminals
Expected: Voltmeter connected to monitoring terminals, not across shunt element

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Dual Power Analyzer Option 020/022 high voltage

Verification and calibration of ac source output voltage and current performance

Ranked causes

1. Initial verification before calibration required (common)

First check

Assemble equipment: 5-pin connector plug, Digital Voltmeter (Agilent 3458A: 10 nV @ 1 V resolution, 8.5 digits, >20 ppm accuracy), Current Monitor (Guildline 7320/0.01: 0.01 Ω, ±200 ppm), Load Resistor (30 ohm 100 W minimum), Capacitor (1.0 µF 50 V, part 0160-3490), Function Generator (Agilent 33120A: 50 mV, 500 mV, 60 Hz sinewave), GPIB Controller (HP Series 200/300 or equivalent)

Test point: Equipment list per Table B-1
Expected: All required equipment present and functional
Tools: Specified equipment per table

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: External current measurement high voltage

Calibrate the Power Analyzer current sense terminals to measure external function generator signal accurately using an Agilent 3458A DVM as reference

Ranked causes

1. Current offset error in sense terminals (common)

First check

Short current sense terminals

Test point: I SENSE
Expected: Shorted across terminals

10 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: External Current Shunt Setting

Verify and update the external current shunt resistance value in the unit to match the label on the physical shunt

Ranked causes

1. Shunt value setting mismatch (common)

First check

Display current shunt value setting

Test point: SHUNT command in Calibration menu
Expected: Resistance value matches label on physical external current shunt

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: External voltage measurement high voltage

Calibrate the Power Analyzer voltage sense terminals to measure external ac voltage source output accurately using an Agilent 3458A DVM as reference

Ranked causes

1. Voltage offset error in sense terminals (common)

First check

Reset unit to known state

Test point: Front panel
Expected: *RST display

8 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Initialization

Unit requires initialization to restore non-volatile memory after corruption or first setup. Erases all calibration, waveform, and list data.

Ranked causes

1. Non-volatile memory corruption or first-time setup (unknown)

First check

Verify EEINIT command appears on display

Test point: Front panel display
Expected: EEINIT <model> shown

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Initialize unit

Non-volatile memory corruption or first-time initialization requiring front panel EEINIT command sequence

Ranked causes

1. Non-volatile memory corruption or first-time setup (unknown)

First check

Turn unit on

Test point: Front panel power switch
Expected: Unit powers on

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Output Frequency Modulation

Configure modulating frequency, frequency deviation, and enable frequency modulation on the output

Ranked causes

1. Frequency modulation parameters not set (unknown)

First check

Verify modulating frequency setting

Test point: FM:FREQ command
Expected: Modulating frequency value displayed Hz

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Post-repair adjustment

Supply requires calibration after replacing A8 DSP Assembly, A9 Output Filter/Relay Assembly, or A10 Control Assembly; A8 replacement requires prior initialization

Ranked causes

1. Component replacement triggers calibration requirement (common)

First check

Verify initialization completed if A8 DSP Assembly was replaced

Test point: A8 DSP Assembly
Expected: Initialization completed

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: ROM upgrade

Update to newer ROM versions without destroying calibration data; identify and upgrade firmware revision

Ranked causes

1. Need to upgrade to newer ROM revision (unknown)

First check

Identify firmware revision

Test point: Front panel display at power-on or GPIB *IDN? query
Expected: Firmware revision displayed for approximately 10 seconds or returned via GPIB

6 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CV error amplifier output incorrect high voltage

CV (constant voltage) error amplifier not responding to RAIL_VMON stimulus; output at U447-7 or U463-3/4 not toggling as expected.

Ranked causes

1. CV error amplifier IC failure (occasional)

First check

Apply 0V stimulus to RAIL_VMON

Test point: RAIL_VMON input
Expected: CV error amp responds; RAIL_OV_INH and RAIL_INH_ISO show expected pulses per test patterns

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Discrete Fault Indicator (DFI) not functioning

J113-1 does not respond to DFI commands or does not go low

Ranked causes

1. DFI signal path or control logic failure (unknown)

First check

Connect +5 Vdc to DFI terminals

Test point: DFI terminals via 5K resistor
Expected: +5 Vdc applied
Tools: 5K resistor, power supply

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Initialization fails with OUT OF RANGE error

OUT OF RANGE error displayed during ROM upgrade, requiring re-initialization and re-calibration

Ranked causes

1. Instrument previously initialized with QA firmware revision or non-volatile memory corrupted (occasional)

First check

Check for OUT OF RANGE error on front panel display

Test point: Front panel display
Expected: OUT OF RANGE error shown

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inverter assembly fails under loaded conditions high voltage

A7 passes static checks but fails when 500 VDC rail applied or under current load

Ranked causes

1. High voltage breakdown on FETs or capacitors (occasional)

First check

Perform initial A7 inverter troubleshooting

Test point: Overall A7 assembly
Expected: All waveforms OK per Fig 4-7

7 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low rail detect circuit not functioning high voltage

Low rail warning or low rail final inhibit signals not toggling at expected thresholds when RAIL_VMON varied.

Ranked causes

1. Low rail detect comparator failure (occasional)

First check

Measure RAIL_LOW_WARN threshold

Test point: U424-14 output
Expected: Toggles at approximately 10.6V RAIL_VMON
Tools: DMM or oscilloscope

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No communications pulses

Waveforms at communication test points never go high or low

Ranked causes

1. Communications circuit failure on A11 Trigger/BNC Board (unknown)

First check

Check communications pulses

Test point: U150-1, U151-5, U153-3, U154-1
Expected: Similar waveforms that go high and low
Tools: Oscilloscope

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

No trigger input recognition

Trigger output pulse not generated when Trig In BNC is shorted

Ranked causes

1. External trigger input path failure (unknown)

First check

Set external trigger mode

Test point: Front panel
Expected: External trigger mode enabled
Tools: Power supply

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No trigger output pulse

Trigger Out BNC does not produce pulse when SHIFT TRIGGER command is entered

Ranked causes

1. Signal path failure from A8 DSP board to Trigger Out (unknown)

First check

Set up trigger output

Test point: Trig Out BNC
Expected: Trigger pulse output
Tools: Oscilloscope

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power Analyzer input measurement setup

Select Power Analyzer input as measurement source and configure frequency measurement source

Ranked causes

1. Measurement source not configured correctly (occasional)

First check

Verify Power Analyzer input selection

Test point: Front panel display phase indicator
Expected: φ2 displayed to indicate Power Analyzer input active

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rail overvoltage detect circuit not responding high voltage

RAIL_OV_INH (rail overvoltage inhibit) signal not toggling at expected threshold; overvoltage protection not triggering.

Ranked causes

1. Rail overvoltage comparator failure (occasional)

First check

Measure RAIL_OV_INH response at U463-3

Test point: U463-3 output
Expected: Signal LOW (≈0V) when RAIL_VMON indicates overvoltage condition; HIGH when normal
Tools: DMM or oscilloscope

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Ramp generator signal incorrect or missing high voltage

Ramp waveform at ramp generator test points not present or does not match expected sawtooth pattern.

Ranked causes

1. Ramp generator IC failure or missing input signal (common)

First check

Measure ramp waveform at U475-7

Test point: U475-7 output
Expected: Sawtooth waveform at ~83 kHz per Figure 4-5D
Tools: Oscilloscope (2.00 V/div, 5.00 us/div)

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Remote Inhibit (RI) not disabling output high voltage

Output does not go to 0 Vac when RI terminals are shorted

Ranked causes

1. RI control signal path failure (unknown)

First check

Set 100 Vac at output

Test point: Output terminals
Expected: 100 Vac
Tools: Voltmeter

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit safety hazard from exposed screw terminals during normal operation high voltage

Connector and barrier block screw terminals remain exposed to contact with personnel during equipment operation, creating electrical shock and arc hazard

Ranked causes

1. Cable hoods or covers not installed or removed during operation (common)

First check

Verify all cable hoods and covers are installed before powering unit

Test point: All Power Analyzer and external shunt connectors and barrier blocks
Expected: Cable hoods and covers fully installed, covering all exposed screw terminals

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Verify AC output voltage detection high voltage

Check ALC RMS voltage detection at J822 when cable to J627 connected and ac source can output

Ranked causes

1. ALC RMS detection not generating expected signals (unknown)

First check

Measure J822-1 AC voltage during ALC RMS detection

Test point: J822-1
Expected: 3 Vac

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Verify current limit response with output short circuit high voltage

Check current limit programming response when output is shorted

Ranked causes

1. Current limit not responding correctly to short circuit (unknown)

First check

Measure J822-3 with output shorted at 5V 4A limit

Test point: J822-3
Expected: -0.75 Vac

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`1`	Non-volatile RAM RD0 section checksum failed	Power-on self-test detects RAM error	error
`10`	RAM selftest failed	Power-on self-test detects RAM error	error
`11-31`	DAC selftest error, expected <n>, read <reading>	Power-on self-test detects DAC output mismatch	error
`2`	Non-volatile RAM CONFIG section checksum failed	Power-on self-test detects RAM error	error
`200`	Outgrd not responding	Runtime communication check fails	error
`201`	Front panel not responding	Runtime communication check fails	error
`210`	Ingrd receiver framing error	Runtime communication check fails	warning
`211`	Ingrd uart overrun status	Runtime communication check fails	warning
`212`	Ingrd received bad token	Runtime communication check fails	warning
`213`	Ingrd receiver buffer overrun	Runtime communication check fails	warning
`214`	Ingrd input buffer overrun	Runtime communication check fails	warning
`215`	Outgrd output buffer overrun	Runtime communication check fails	warning
`216`	RS-232 receiver framing error	Runtime RS-232 communication fails	warning
`217`	RS-232 receiver parity error	Runtime RS-232 communication fails	warning
`218`	RS-232 receiver overrun error	Runtime RS-232 communication fails	warning
`219`	Ingrd inbuf count sync error	Runtime communication check fails	warning
`220`	Front panel uart overrun	Runtime communication check fails	warning
`221`	Front panel uart framing	Runtime communication check fails	warning
`222`	Front panel uart parity	Runtime communication check fails	warning
`223`	Front panel buffer overrun	Runtime communication check fails	warning
`224`	Front panel timeout	Runtime communication check fails	warning
`3`	Non-volatile RAM CAL section checksum failed	Power-on self-test detects RAM error	error
`4`	Non-volatile RAM WAVEFORM section checksum failed	Power-on self-test detects RAM error	error
`40`	Voltage selftest error	Power-on self-test voltage output incorrect	error
`401`	Calibration command blocked due to INHIBIT CAL switch setting	Calibration command sent when INHIBIT CAL switch is active	error
`401`	CAL switch prevents calibration	Calibration command executed with CAL switch in wrong position	error
`402`	CAL password is incorrect	Calibration command executed with wrong password	error
`403`	CAL not enabled	Calibration command executed without enabling calibration mode	error
`404`	Computed readback cal constants are incorrect	Calibration process detects computed values out of range	error
`405`	Computed programming cal constants are incorrect	Calibration process detects computed values out of range	error
`406`	Incorrect sequence of calibration commands	Calibration commands executed out of order	error
`43`	Current selftest error	Power-on self-test current output incorrect	error
`5`	Non-volatile RAM STATE section checksum failed	Power-on self-test detects RAM error	error
`6`	Non-volatile RAM LIST section checksum failed	Power-on self-test detects RAM error	error
`600`	Systems in mode:list have different list lengths	Multiple channels configured with unequal list lengths	warning
`601`	Requested voltage and waveform exceeds peak voltage capability	Command requests voltage/waveform combination beyond rating	error
`602`	Requested voltage and waveform exceeds transformer volt-second rating	Command requests voltage/waveform combination exceeding transformer rating	error
`603`	Command only applies to RS-232 interface	Non-RS-232 interface executes RS-232-only command	warning
`604`	Trigger received before requested number of pre-trigger readings	Trigger arrives before pre-trigger buffer fills	warning
`605`	Requested RMS current too high for voltage range	Command requests current beyond voltage range capability	error
`606`	Waveform data not defined	Command references undefined waveform	error
`607`	VOLT, VOLT:SLEW, and FUNC:SHAP modes incompatible	Incompatible mode commands combined	error
`608`	Measurement overrange	Measurement exceeds input range of ADC	warning
`609`	Output buffer overrun	Output data rate exceeds buffer capacity	warning
`610`	Command cannot be given with present SYST:CONF setting	Command incompatible with current system configuration	error
`7`	Non-volatile RAM RST section checksum failed	Power-on self-test detects RAM error	error
`70`	Fan voltage failure	Power-on self-test detects fan voltage out of range	warning
`80`	Digital I/O selftest error	Power-on self-test detects digital I/O failure	error
`CAL DENIED`	Calibration is locked and cannot be modified	Attempting to enter calibration mode when internal switch prevents calibration changes	error
`Error 613`	Frequency deviation exceeds maximum allowed value	Frequency deviation set to value greater than or equal to programmed output frequency, or within 0.001 Hz margin	error
`OUT OF RANGE`	Entered calibration password is incorrect	Pressing Enter after entering wrong CAL ON password	error

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.