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HYDRA
Service Manual
4-22
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).