VTI Instruments Metek EX1202 User Manual page 120

VTI Instruments Corp.

Digits: Indicates the number of significant digits that will be used when measurements are
taken. Note that this property and Aperture Time are interrelated hardware settings. Thus,
changing one affects the other.
Optional Settings
Some functions require optional settings. These settings are displayed only if a function requiring
them is selected. Otherwise, this space is left blank.

These options apply only to ac and dc current measurements.
Minimum: Specifies the minimum expected frequency.
Maximum: Specifies the maximum expected frequency.

These options apply only to frequency and period measurements.
Voltage Range: select the voltage range that will be used when the frequency/period

These options apply only to temperature measurements.
When Thermocouple is selected as the transducer, the following options are available:
When Thermistor is selected as the transducer, the following options are available:
When 2/3/4W RTD is selected as the transducer, the following options are available:
Trigger Settings
In the Trigger Settings field, the user can change the setting that control the triggering capabilities
of the DMM.

Trigger Input: Each time a trigger input event occurs, the DMM enters the Sample Trigger
layer.
Source: Indicates the event type that will cause a trigger input event. These include
Route: This button appears when a backplane line (BPL0 – 7) is selected for Source.
Slope: For hardware trigger lines, this parameter indicates the slope of level change, either
Count: Indicates the number of trigger input events that will be accepted before returning to
120
measurement will be made. Same options apply as for the DCV and ACV modes above.
TC Type: Select the TC that will be used during the measurement. Select from Type B,
Type E, Type J, Type K (default), Type N, Type R, Type S, or Type T.
Reference Junction: Determines whether the reference junction is Fixed (default) or
External.
Fixed Reference Junction: If Fixed is selected above, enter the temperature of this
reference junction here.
R: Indicates the resistance value for the thermistor. Select from 2252 Ω, 5 kΩ, 10 kΩ
(default), and User Resistance.
A, B, and C: If User Resistance is selected for R, the user must provide the Steinhart-
Hart equation coefficients for the thermistor.
Is Reference Junction check box: When checked, this indicates that the thermistor is
being used as a reference junction.
Type: Indicates the RTD type that will be used for measurement. Select from PT100
(default), D100, F100, PT385, PT3916, User.
R, A, B, and Δ: If User is selected for Type, the user must provide the Callendar-
Van Dusen equation coefficients for the RTD.
Is Reference Junction check box: When checked, this indicates that the RTD is being
used as a reference junction.
Immediate, External, Software, BPL0 – 7.
Clicking this button launches a dialog box that allows the user to select an external
trigger line (LXI0 – 7, DIO0 – 7, LAN0 – 7, or ALARM0) to connect to the chosen
backplane line.
Rising or Falling, that will cause a trigger input event. The slope parameter has not effect
when Immediate or Software is selected.
the Idle state. Valid values are -1 and 1 to 2,147,483,647, where "-1" sets an infinite
count.
EX1200 Triggering