Fluke 8808A User Manual - Page 51

Selecting a Function Modifier, Table 3-4. RS-232 Pin Out, Description

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3 Operating the Meter from the Front Panel Selecting a Function Modifier An external TTL signal on pin 9 will trigger a measurement cycle. Alternatively, pin 9 of the RS-232 interface can be connected to pin 1 through an external switch. See Figure 312. A measurement cycle is trigger when the switch is closed and the +5 volts from pin 1 is applied to pin 9. The trigger event occurs on the rising edge of the signal applied to pin 9. Table 3-4. RS-232 Pin Out 12345 6789 Pin # 1 3 6 Description +5 V OUT RS-232 TXD Trigger Out Pin # 2 5 9 Description RS-232 RXD RS-232 GND Trigger In eue23.eps Figure 3-12 shows a method for using the +5V OUT (pin 1) signal with an external switch to trigger the Meter. +5 V Out (Pin 1) Trig In (Pin 9) Figure 3-12. External Trigger Circuit eue24.eps Selecting a Function Modifier This section describes the function modifiers available with the Meter. Function modifiers are actions that the Meter performs on an input before a reading is displayed (for example, a comparison to another value). Function modifiers can be used in combination. See the "Using Function Modifiers in Combination" section later in this chapter. To use a function modifier, press a measurement function button to select that function, and then press the function modifier button to modify that function. (For example, press D to select dc voltage measurement, and then press I to select the Touch Hold function to hold the results of your measurement). Note that modified readings are shown on the primary display only. 3-17

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Operating the Meter from the Front Panel
Selecting a Function Modifier
3
3-17
An external TTL signal on pin 9 will trigger a measurement cycle. Alternatively, pin 9 of
the RS-232 interface can be connected to pin 1 through an external switch. See Figure 3-
12. A measurement cycle is trigger when the switch is closed and the +5 volts from pin 1
is applied to pin 9. The trigger event occurs on the rising edge of the signal applied to
pin 9.
Table 3-4. RS-232 Pin Out
1
2
3
4
6
7
8
9
5
eue23.eps
Pin #
Description
Pin #
Description
1
+5 V OUT
2
RS-232 RXD
3
RS-232 TXD
5
RS-232 GND
6
Trigger Out
9
Trigger In
Figure 3-12 shows a method for using the +5V OUT (pin 1) signal with an external
switch to trigger the Meter.
+5 V Out (Pin 1)
Trig In (Pin 9)
eue24.eps
Figure 3-12. External Trigger Circuit
Selecting a Function Modifier
This section describes the function modifiers available with the Meter. Function
modifiers are actions that the Meter performs on an input before a reading is displayed
(for example, a comparison to another value). Function modifiers can be used in
combination. See the “Using Function Modifiers in Combination” section later in this
chapter.
To use a function modifier, press a measurement function button to select that function,
and then press the function modifier button to modify that function. (For example, press
D
to select dc voltage measurement, and then press
I
to select the Touch Hold
function to hold the results of your measurement). Note that modified readings are shown
on the primary display only.