5-16 Rel, Math, Ratio, Channel Average, dB Model 2701 User’s Manual
Basic operation
NOTE Make sure the INPUTS switch is set to the REAR position (in).
1. Select and configure (range, filter, rel, etc.) a valid measurement function. For ratio,
the only valid function is DCV. For channel average, the only valid functions are
DCV and TEMP (TCs only).
2. Use the
or key to select (close) a primary channel (101 through 110 for the
Model 7700). The CLOSE key can also be used.
3. Apply one signal to the selected primary channel and apply the other signal to the
paired channel. For the Model 7700, if the closed primary channel is 101, the
paired channel is 111.
4. Enable Ratio or Channel Average:
• Ratio — Press SHIFT and then RATIO. The RATIO annunciator will turn on
to indicate that the displayed readings are the result of the ratio calculation.
• Channel Average — Press SHIFT and then CHA-AVG. The DELTA
annunciator will turn on to indicate that the displayed readings are the result of
the channel average calculation. To disable channel average, again press
SHIFT and then CH-AVG.
5. When finished, there are two ways to disable the calculation:
• Press the OPEN key. The calculation will disable and the channel will open.
• Press SHIFT and then RATIO to disable ratio or press SHIFT and then
CHA-AVG to disable channel average. The calculation will disable, but the
channel will remain closed.
NOTE The paired channel number is not displayed when it is measured. Only the
primary channel is displayed during the 2-channel scan for the calculation.
Enabling ratio disables channel average and conversely, enabling channel
average disables ratio.
If either of the channel readings over range (“OVRFLW”), the result of the
calculation will also be “OVRFLW.”
When using limits with ratio or channel average, the limit values will be
compared to the result of the calculation and not to the individual channels.
With ratio or channel average enabled, pressing a function key will display the
“EXIT RATIO” or “EXIT CHA-AVG” message to indicate that the calculation
must first be disabled as explained in step 5 of the above procedure.
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