HYDRA

Service Manual

To provide accuracy at full range, calibration is not recommended below one-third of full range (10000 counts).

Command

Cal x

Table 4-8. Calibration Mode Computer Interface Commands

Description

Start calibration of a new function.

x

Function to calibrate

 

 

1VDC

2VAC

3ohms

4Frequency

CAL_CLR

CAL_CONST? xx

CAL_REF?

CAL_REF < value>

CAL_STEP?

EEREG? xx

Reset all calibration constants to nominal values, clearing present calibration.

Return the value of the calibration constant indicated by xx.

Return the present calibration reference.

Calibrate to <value>, rather than the default calibration reference value.

Calibrate and return the calibrated value of the input.

Return the contents of the specified EEPROM register (xx).

The following additional computer interface commands can be used in calibration mode. Use of any other command results in an execution error. Refer to Section 4 of the Hydra Users Manual for complete information about these computer interface commands.

*CLS *ESE *ESE?*ESR?*IDN?*OPC *OPC?*RST *SRE *SRE?*STB?*TRG *WAI IEE IEE?IER?LOCS LWLS REMS RWLS

4-21. Using Hydra Starter Calibration Software

This procedure uses the Hydra Starter Package (with Calibration Software) for closed- case calibration. This software runs on an IBM PC or equivalent using the RS-232 interface. It consists of the following three files:

∙An executable file (CAL.EXE)

∙A help text file (CAL.HLP)

∙A configuration initialization file (CAL.INI)

4-22. Setup Procedure Using Starter

Use the following procedure to set up Hydra and the PC prior to using the calibration feature of the Hydra Starter Package:

1.Connect a pair of test leads to the channel 1 H (high) and L (low) terminals on the Input Module. Connect a second pair of test leads to channel 11. (This second pair is used only for 4-wire resistance calibration.) Install the Input Module into Hydra.

2.Using the RS40 Terminal Interface Cable, connect the PC COM port to the Hydra RS-232 port. Use an RS40 and an RS41 cable in series to connect to the COM port on an IBM PC/AT.

4-20

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Fluke 2635A, 2625A service manual Using Hydra Starter Calibration Software, Setup Procedure Using Starter, Command
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2635A, 2625A specifications

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