HYDRA

Service Manual

4-24. Using a Terminal

This procedure can be used with either a terminal or a computer running a terminal emulation program.

4-25. Setup Procedure Using a Terminal.

Use the following procedure to set up Hydra and the PC:

1.Connect a pair of test leads to the high and low terminals of channel 1 on the Hydra Input Module. Connect a second pair of test leads to channel 11.

2.Install the Input Module into Hydra.

3.Connect the COM port of the PC or terminal to the Hydra RS-232 port using an RS40 Terminal Interface Cable. Use an RS40 and an RS41 cable in series to connect to the COM port on an IBM PC/AT.

4.On Hydra, press POWER ON. After the initialization process has concluded, use the following procedure to set up communications:

a.Press SHIFT and then LIST(COMM).

b.With ’BAUd’ displayed, use the UP or DOWN arrow key to selectthe desired baud rate. Then press ENTER.

c.With ’PAR’ (parity) displayed, use the UP or DOWN arrow key toselect the parity. Then press ENTER.

d.With ’CtS’ (2635A only; Clear to Send) displayed, use the UP orDOWN arrow key to select the Clear to Send flow control ’OFF’.Then press ENTER.

e.With ’ECHO’ displayed, use the UP or DOWN arrow key to select’ON’. Then press ENTER. Communications setup for Hydra is nowcomplete.

5.On the terminal, match the communication parameters used for Hydra (above).

6.On Hydra, break the calibration seal on the front panel display. Then press and hold the CAL Enable button (approximately 4 seconds) until CAL is shown on the Hydra display. Press this button with a blunt-tipped object. Avoid using a sharper-tipped object (such as a pencil).

7.Connect the channel 1 test leads to the output of a 5700A.

4-26. Calibration Procedure Using a Terminal

Calibration procedures using a terminal (or a computer program that emulates a terminal) are presented in the following tables:

∙DC Volts (CAL 1) Calibration:Table 4-9

∙AC Volts (CAL 2) Calibration:Table 4-10

∙Ohms (CAL 3) Calibration:Tables 4-11, 4-12

∙Frequency (CAL 4) Calibration: Table 4-13

In the tables, the CAL_REF? query asks Hydra for the next calibration reference value. If some other value is to be used, the CAL_REF xxx.xxxx command tells Hydra the calibration reference value to expect.

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

4-22

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Fluke 2635A, 2625A service manual Setup Procedure Using a Terminal, Calibration Procedure Using a Terminal
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2635A, 2625A specifications

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