Performance Testing and Calibration

4

Updating 2635A Data Bucket Embedded Instrument Firmware

Firmware downloading may be accomplished by using either of the two methods that are described in the following paragraphs.

Default Instrument Firmware Download Procedure

Using LD2635 Firmware Loader Directly

Table 4-13. Frequency Calibration

Command

CAL 4

CAL_REF?

CAL_STEP?

Response

=>

+10.000E+3

Action

Put Hydra in Frequency Cal.

Output 2.9 volts ac at 10 kHz from the 5700A. Wait about 8 seconds.

Hydra computes calibration constant 21 and returns the calibrated reading (for example, +10.000E+3.) (For software versions lower than 5.4, this step computes calibration constant 19.)

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.

Now set the 5700A output to 0V dc.

4-32. Setup Procedure for Firmware Download

Use the following procedure to set up the 2635A and the PC, before attempting to download firmware to the instrument:

1.Copy the files from the diskette to your PC hard drive. All following PC operations should be done in the directory on the PC where these files are located.

2.Using the RS40 Terminal Interface Cable, connect the PC COM port to be used to the 2635A RS-232 port. Use an RS40 and an RS41 cable in series to connect to the COM port on an IBM PC/AT.

3.On the 2635A, 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 select’19200’ baud. Then press ENTER.

c.With ’PAR’ (parity) displayed, use the UP or DOWN arrow key toselect ’no’ parity. Then press ENTER.

d.With ’CtS’ displayed, use the UP or DOWN arrow key to selectthe Clear to Send flow control ’On’. Then press ENTER.

e.With ’ECHO’ displayed, use the UP or DOWN arrow key to select’OFF’. Then press ENTER. Communications setup for the 2635A isnow complete.

4-33. Default Instrument Firmware Download Procedure

Use the following procedure to download the version of 2635A instrument firmware that is distributed on the diskette:

4-29

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Fluke 2625A, 2635A service manual Setup Procedure for Firmware Download, Default Instrument Firmware Download Procedure

2635A, 2625A specifications

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