Agilent Technologies 66001A manual Equipment Required, Calibrating Voltage

Equipment Required

The equipment listed in Table A-1, or equivalent, is required for calibration.

	Table A-1. Equipment Required for Calibration
Equipment	Characteristics	Recommended Model
Voltmeter	D-c accuracy 0.005%, 6 digits; resolution 1 μV	Agilent 3458A
Shunt
Agilent 66101A,	0.01Ω, 100 A, 100 W, 0.04% @ 100 W, 0.01% @ 1W,	Guildline 9230/100
66102A	power coeff. 0.0004%/watt in air
Agilent 66103A,	0.1 Ω, 15 A, 25 W, 0.04% @ 25 W, 0.01% @ 1W, power	Guildline 9230/15
66104A, 66105A,	coeff. 0.002%/watt in air
66106A
GPIB Controller or	HP Vectra (or IBM compatible) with GPIB Interface or Agilent BASIC series Agilent 66001A
Keyboard	MPS

Calibrating Voltage

Calibration may cause dangerous voltages to be present at the power module output.

The following procedure calibrates the output voltage and the overvoltage protection (OVP). During voltage calibration, you will enter two readings from the external DVM. You must calibrate the voltage before calibrating the OVP. You do not have to enter any external readings when calibrating the OVP.

	Table A-2. Voltage Calibration Procedure
Keyboard Entry		Controller Entry †	Function
	Connect the equipment as shown in Figure A-lA
Output Voltage Calibration
		*RST	Reset the power module
(Before proceeding, set the module output, via the keyboard or the GPIB, for 1.0 V at 0.5 A)
		OUTP ON	Enable the output
		CAL:STAT 1,66102	Using your password, enable the calibration
			mode
		CAL:VOLT:LEV MIN	Select the lower calibration point
		CAL: VOLT: DATA <NRf>	Enter the digital voltmeter reading
		CAL:VOLT:LEV MAX	Select the upper calibration point
		CAL:VOLT:DATA <NRf>	Enter the digital voltmeter reading

Note: The following step overwrites the existing voltage calibration constants stored in nonvolatile memory.

CAL:SAVSave the new calibration constants

Overvoltage Protection Calibration

If the optional output relay is installed, either disconnect it or set it to the OFF (open) state.

CAL:VOLT:PROT Perform OVP calibration

Note: It takes a few seconds for the power module to make the measurement. When completed, the new constant is automatically stored in nonvolatile memory.

†See Figure A-2 for program listing.

‡Enter the voltage measured by the external digital multimeter.

36 Calibration