By Approximate; Ratio And Difference Display Messages - Keithley 194 Instruction Manual

OPERATION
J Vdt = [ 5.3V + 5V + 110.05V ] 0.001
J Vdt = 0.12035 VOLT SECONDS
Figure 3-14. Integration by Approximate Area
Summation
3.13.7 Waveform Mode
The waveform mode can be used to display the buffer sam-
ple that occurs at the trigger point. If it is not possible to
display the trigger point location, the instrument will
display the location as close as possible to the trigger point.
The RECALL button can be used to view samples stored
at other buffer locations.
A typical display in the waveform mode might bc:
1.5467V DC Tl
In this instance, the reading is 1.5467 and T indicates that
the trigger point is being displayed.
3.14 RATIO AND DIFFERENCE
When the optional Model 1944 is installed, the Model 194
can be programmed to display the ratio or difference be-
tween channels 1 and 2, as discussed in the following
paragraphs.
RATIO & DIFFERENCE BUTTONS
Display messages associated with these modes are sum
marized in Table 3-11. Note that the instrument displays
the following message if one of these mode buttons is
pressed with no channel 2 module present:
NO A/D IN 012.
Most other front panel buttons are inoperative \vhcn in
the ratio or difference modes.
Table 3-11. Ratio and Difference Display Messages
L
Message* Description
1.2345EO1 XX '1.2 Display diffwcncc between
channels 1 and 2 (see below 1~1
XX units).
1.2345E.3 XX 112 Display ratio of channel 1 to
channel 2 (see below for XX
units).
NO A/D IN CH2 1944 option not inst.tlled.
xx= Descri+on
blanks Dimensionless
VS Volt-seconds
V Volts
S
Seconds
l/S Reciprocal seconds
??
Invalid units
*Displayed values depend on calculated result.
3.14.1 Difference Mode
By pressing the CHl-CH2 key, you can display the dif-
ference between the channel 1 reading and the channel
2 reading. A typical display in this mode might bc:
1.2567Em3 V 1-2
3-33