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Model 2701 User’s Manual Rel, Math, Ratio, Channel Average, dB 5-3

3. If using a switching module, use the  or  key to select (close) the input channel.

If using the front panel inputs (FRONT inputs selected), it does not matter if a

switching channel is closed.

4. Press the REL key to set the rel value. The display will zero and the REL

annunciator will turn on.

5. Apply the signal to be measured.

Pressing REL a second time disables rel.

You can input a rel value manually using the mX+b function. Set M for 1 and B for any

value you want. The mX+b function is covered in this section (see “Math,” page 5-7).

Scanning

When a simple scan is conﬁgured, the present rel setting will apply to all channels in the

scan. When an advanced scan is conﬁgured, each channel can have its own unique rel

setting. Details to conﬁgure and run a scan are provided in Section 7.

For an advanced scan, the following general procedure shows how to conﬁgure a scan

channel to use rel:

1. While in the normal measurement state, select the appropriate function and close

the appropriate channel. For example, if scan channel 101 is going to be conﬁgured

for DCV and use rel, select DCV and close channel 101.

2. Apply the DCV signal to be rel’ed to the closed channel. This could be an offset or

a baseline level.

3. Press the REL key to enable rel (REL annunciator on). The input signal level is

used as the rel value.

4. When conﬁguring the advanced scan (as explained in Section 7), select the desired

channel, press DCV and then press REL (REL annunciator on).

When the channel is scanned, rel will enable using the rel value established in step 3.

For remote programming, the <clist> parameter is used to conﬁgure channels for a scan.

Keithley 2701 User Manual

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