BASIC DMM OPERATION
2.11.2 Scanner Display Format
The front panel display format is similar to normal display
format with one important exception: The channel number
appears in the right most digit of the display while the
scanner is operating. The selected measuring function will
also appear on the display except when on channels 2
through 8 while in the ratio mode. The ratio mode is
discussed in detail in paragraph 2.11.5.
2.11.3 Pole Mode Programming
As discussed in paragraph 2.11.1, the Z-pole mode is in-
tended for use with volts, and 2-wire ohms measurements,
while the $-pole mode is designed for use with 4-wire
resistance measurements. For proper operation, the pro-
grammed pole mode must agree with the pole cotigura-
tion discussed in paragraph 2.11.1.
The pole mode can be programmed by using the SCAN
SElVP key as outlined below.
1. Press SHIFT SCAN SETUP to display the pole mode.
For the 2-pole mode, the display will appear as follows:
2 POLE
2. For the 4-pole mode, the display shows:
4 POLE
3. Use uprange or downrange as necessary to toggle the
pole mode to the desired status.
4. Once the desired pole mode is selected, press NEXT
once to advance to the next menu selection (ratio), or
press NEXT three times to return to normal display.
NOTE
A “CHAN 4 MAX” error will occur if you attempt
to select the 4pole mode with a channel limit
greater than four.
2.11.4 Ratio Mode
The ratio mode divides the channel 2 through 8 readings
by the channel 1 reading as follows:
CHn
R=-
CHI
Where: R = ratio
CHn = channel 2 through 8
CHl=CHl
The ratio mode is available for all three scan modes
(discussed below). While in ratio, the instrument displays
the selected function for channel 1, and the actual ratios
without units for channels 2 through 8.
Ratio can be enabled or disabled by using the SCAN
SETUP key as follows:
1. Press SHIFT SCAN SETUP and then NEXT twice to
display the current ratio status. With ratio disabled, the
display is:
RATIO OFF
2. For ratio enabled, the display shows:
RATIO ON
3. To change the ratio status, press uprange or downrange.
4. Once the desired ratio status is displayed, press NEXT
once to advance to the next selection, or press NEXT
twice to retom to normal display.
NOTES:
1. In the MANUAL mode, you must manually access
channel 1 first before attempting to display the ratio on
channels 2 through 8.
2. The ratio is automatically scaled if the range is chang-
ed after the channel 1 reading is taken in order to main-
tain a constant ratio reference value across ranges. For
example, if you take a 1OV channel 1 reading on the 3w
reading, the ratio reference wilI remain 1OV on the 3OOV
range.
3. Setting the range lower than the channel 1 ratio
reference reading will cause an overflow.
4. The minimum ratid display value is equal to the display
resolution. The maximum ratio is 9.99999. Exceeding
this value will cause an overflow error.
2.11.5 Reading Interval
The reading interval parameter determines the timi period
between channels for the STEP mode, or the time between
channel sets in the SCAN mode when the unit is in the
continuous trigger mode. (In one shot, the trigger period
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