Filter
Top Products
HYDRA
Service Manual
4-28
Table 4-12. 4-Wire Ohms Calibration (5700A)
Command Action
CAL 3 Puts Hydra in OHMS Calibration
Note
With the following CAL_REF commands, send the actual resistance value
(e.g., xxx.xxxxx) displayed by the 5700A.
Source 190Ω from the 5700A. Then wait 4 seconds for the 5700A to settle.
CAL_REF xxx.xxxxx
CAL_STEP? Hydra computes calibration constant 15 and returns the calibrated reading. (For
software versions lower than 5.4, this step computes calibration constant 13.)
Note
If the input is incorrect, the "!>" response signifies that a Device
Dependent Error has been generated. The calibration step could not be
executed.Verify that the input to Hydra channel 1 is the correct value. Also
verify that the 5700A is in OPERATE mode. If the input is correct, Hydra
may require repair.
Source 1.9 kΩ from the 5700A. Then wait 4 seconds for the 5700A to settle.
CAL_REF xxxx.xxxx
CAL_STEP? Hydra computes calibration constant 16 and returns the calibrated reading. (For
software versions lower than 5.4, this step computes calibration constant 14.)
Source 19 kΩ from the 5700A. Then wait 4 seconds for the 5700A to settle.
CAL_REF xxxxx.xxx
CAL_STEP? Hydra computes calibration constant 17 and returns the calibrated reading. (For
software versions lower than 5.4, this step computes calibration constant 15.)
Source 190 kilohms from the 5700A. Then wait 4 seconds for the 5700A to settle.
CAL_REF xxxxxx.xx
CAL_STEP? Hydra computes calibration constant 18 and returns the calibrated reading. (For
software versions lower than 5.4, this step computes calibration constant 16.)
Source 1.9 megohms from the 5700A. Then wait 4 seconds for the 5700A to
settle.
CAL_REF xxxxxxx.x
CAL_STEP? Hydra computes calibration constants 19 and 20 and returns the calibrated
reading. (For software versions lower than 5.4, this step computes calibration
constants 17 and 18.) Now set the 5700A output to 0.
4-31. Using the PC Compatible Firmware Loader Software
This procedure uses the 2635A Embedded Firmware Memory Loader Package for
closed-case updating of the internal firmware in the 2635A. This software runs on an
IBM PC or equivalent using the RS-232 interface. It consists of the following files:
• An executable file (LD2635.EXE)
• A text file containing usage information (README.TXT)
• A 2635A instrument firmware file (DB_6_9.HEX for example)
• A batch file to load the firmware via COM port #1 (LOADC1.BAT)
• A batch file to load the firmware via COM port #2 (LOADC2.BAT)