Performance Testing and Calibration

4

Calibration

Once the calibrator output has been set to Hydra, the CAL_STEP? query performs the calibration step and returns the calibrated value of the input. The response to CAL_STEP? must be received before each new step can begin. With some steps, a noticeable delay may be encountered.

Command

CAL 1

CAL_REF?

CAL_STEP?

Response

=>

+90.000E-3

Table 4-9. DC Volts Calibration

Action

Puts Hydra in VDC Calibration.

You output 90 mV dc from the 5700A. Wait about 10 seconds.

Hydra computes calibration constant 1 and returns the calibrated reading (for example, +90.000E-3.)

Note

If the input is incorrect, the "!>" response signifies that a Device Dependent Error was generated. The calibration step could not be executed. Verify that the input to Hydra channel 1 is the correct value and polarity. Also verify that the 5700A is in OPERATE mode. If the input is correct, Hydra may require repair.

CAL_REF?

CAL_STEP?

CAL_REF?

CAL_STEP?

CAL_REF?

CAL_STEP?

CAL_REF?

CAL_STEP?

CAL_REF?

CAL_STEP?

+900.00E-3

+290.00E-3

+2.9000E+0

+29.000E+0

+290.00E+0

You output 900 mV dc from the 5700A. Wait 4 seconds.

Hydra computes calibration constant 2 and returns the calibrated reading.

You output 290 mV dc and wait 4 seconds.

Hydra computes calibration constant 3 and returns the calibrated reading.

You output 2.9V dc and wait 4 seconds.

Hydra computes calibration constant 4 and returns the calibrated reading.

You output 29V dc and wait 4 seconds.

Hydra computes calibration constant 5 and returns the calibrated reading.

You output 290V dc and wait 4 seconds.

Hydra computes calibration constant 6 returns the calibrated reading. Now change the 5700A output to 0.0V dc

4-27. Ohms Calibration

Resistor values of 290Ω, 2.9 kΩ, 29 kΩ, 290 kΩ, and 2.9 MΩ are preferred. Use either fixed resistors or a decade resistance source having the required accuracy (see Table 4- 1.) Connect the channel 11 test leads and the channel 1 test leads to the source resistance. Refer to Figure 4-5 and Table 4-11 for related setup and calibration procedures.

The 5700A can also be used as a resistance source. Connect the 5700A to Hydra for 4- Wire Ohms Calibration. Connect the channel 11 test leads to the 5700A OUTPUT terminals and the channel 1 test leads to the 5700A SENSE terminals. Verify that 5700A EXT SNS is ON. Select the 5700A output as specified in each step. Refer to Figure 4-6 and Table 4-12 for related setup and calibration procedures.

4-23

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Fluke 2625A, 2635A service manual Response, DC Volts Calibration Action
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