HP 1GSa/s Digitizing Oscilloscope 16532A manual Instrument Warmup, Calibration

HP 16532A - Calibration

To run the scope calibration, the switch must be in the UNPROTECT position. When you have more than one HP 16532A board in a mainframe, this must be done for each one of the boards. After calibration is complete, all the switches must be set to the PROTECT position to save the calibration values. Also, all the modules or filler panels must be reinstalled in the mainframe, then a seal should be placed on the equipment such that the seal touches both the top-most module and the mainframe. This is done to assure that calibration integrity is maintained.

4-6. Recommended Test Equipment

The only test equipment required for calibration are cables and adapters. These are listed in paragraph 4-10 and are called out in the applicable calibration procedure.

When ordered with a system, oscilloscope modules are calibrated at Hewlett-Packard as single units (not chained together). If you need to use the modules as one unit (chained together), perform the Time Null Calibration in section 4-12.

The calibration procedure sets the oscilloscope calibration factors and stores them in non-volatile RAM on the board. The procedures use signals generated in the oscilloscope module itself to calibrate channel sensitivity, offset, and trigger parameters. The calibration factors set up the module each time the instrument is turned on.

The calibration procedures in this section should be followed in their entirety and in the sequence listed in table 4-1. Though in this section the default calibrations are loaded before calibration, calibration can be done without loading them. However, if they are loaded, they should be loaded before an actual calibration is done.

4-7. Instrument Warmup

Calibrate the oscilloscope module at its environmental ambient temperature, after a 30-minute warmup period of the

HP 16500A/16501A mainframe with the module installed.

4-8. Calibration

This section provides software calibration procedures for the HP 16532A oscilloscope module. There are no hardware adjustments on the oscilloscope module. The calibration is performed without access to the interior of the instrument.

When calibrating the module, it must be installed in the mainframe, and the mainframe covers and filler panels must be in place. The module must be warmed up (refer to "Instrument Warmup" given earlier in this section).

Calibration procedures require the use of cables and adapters only. Non-service personnel can perform the calibration, however, to do the calibration, it is necessary to unprotect the current calibration values. This may not be allowed in some circumstances − check with your Calibration Laboratory or Service Department before you attempt calibration. To perform calibration, follow the "Self Cal Menu Calibration" procedures given later in this section.

Table 4-1. Calibration Sequence

Sequence	Calibration	Paragraph
1	Set the PROTECT/UNPROTECT Switch to UNPROTECT	4-9
2	Default (Not required as part of the calibration procedures)	4-11
	Self Cal Menu
3	Vertical Calibration (all channels)	4-12
4	Delay Calibration− Channel 1	4-12
	Delay Calibration− Channel 2	4-12
5	Time Null Calibration (all channels)	4-12
6	Logic Trigger - Channel 1	4-12
7	External Trigger Null Calibration	4-12
8	Set the PROTECT/UNPROTECT Switch to PROTECT	4-13

4-2