Front Panel Operation
2-123
NOTE
If any LIMITS control is enabled
(LOLIM1 or 2, HILIM1 or 2— High,
Low, or Pass), the OUTPUT-STATE menu
does not check or change the output status.
Refer to paragraph 2.19.5 for information
on limits.
DIGOUT menu items
The DIGOUT menu is used to configure the following oper-
ations:
• Check or change the STATE (ON or OFF) of the four
digital output lines.
• Check or change the LOGIC-SENSE of the digital out-
put lines. The logic sense can be active-high (ON =
+5V) or active-low (ON = 0V).
STATE: Use this menu item to check or change the state (on
or off) of the four digital output lines. The actual level of an
“on” line is determined by the sense, which is controlled by
the next menu item (LOGIC-SENSE).
The state (on or off) of a digital output line is changed by
placing the cursor on the desired line and pressing the
RANGE ▲ or ▼ key. These keys simply toggle the state.
With the lines configured as desired, press ENTER.
LOGIC-SENSE: Use this menu item to check or change the
sense of the digital output lines. The sense of each line can
be active-high (ON = +5V) or active-low (ON = 0V). When
LOGIC-SENSE is selected, you will be prompted to select
the desired output line:
• TTL1, TTL2, TTL3 OR TTL4 — Selects the digital
output line and displays the following options:
ACTIVE-HIGH — Use this option to set the sense of
the selected output line to active-high.
ACTIVE-LOW — Use this option to set the sense of the
selected output line to active-low.
To check or change output sense, place the cursor on the ap-
propriate line and press ENTER. Cursor position indicates
the present logic sense for the selected line (ACTIVE-HIGH
or ACTIVE-LOW). To change the sense, place the cursor on
the alternate selection and press ENTER.
SERIAL #
This item displays the serial number, SCPI version, and firm-
ware revision levels of the instrument. The following infor-
mation is displayed:
Serial #XXXXXX
SCPI version 1991.0 software rev AXX AYY
where: #XXXXXX is the serial number of the instrument.
AXX is the firmware level for the main microcon-
troller.
AYY is the firmware level for the display microcon-
troller.
A/D CONTROLS
With this GENERAL MENU item, you can control line syn-
chronization, and enable or disable humidity and external
temperature measurements.
LINE-SYNC: Synchronizing A/D conversions with the pow-
er line frequency increases common mode and normal mode
rejection. When line cycle synchronization is enabled, the
measurement is initiated at the first positive-going zero
crossing of the power line cycle after the trigger (see Figure
2-82).
When LINE-SYNC is selected, the power line frequency is
displayed and the options for line synchronization are dis-
played:
•ENABLED — Enables line synchronization.
• DISABLED — Disables line synchronization.
Changing the state of line synchronization halts triggers and
puts the instrument into idle. Press TRIG to return to re-arm
triggers.
DATA-STAMP: This menu item is used to enable or disable
humidity and/or external temperature measurements. The
relative humidity reading is controlled by placing the cursor
on HUMIDITY and using a range key (▲ and ▼) to toggle
between the desired state (ON or OFF). In a similar manner,
Figure 2-82
Line cycle synchronization
Power Line
Frequency
0
1
23 PLC
A/D
Conversion
#1 starts
A/D
Conversion
#2 starts
A/D
Conversion
#3 starts
Note: A/D conversions assume an integration
time of ≤ 1 PLC (Power Line Cycle)
Trigger #1
occurs in
this region
Trigger #2
occurs in
this region
Trigger #3
occurs in
this region
1
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