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E1437A User's Guide
VXI plug&play Programming Reference
Parameters
id is the VXI instrument session pointer returned by the hpe1437_init function.
range is a range index number between 0 and 9 which is transformed to a full scale
voltage value. The corresponding discrete legal values of full scale vary from 0.02 volt
to 10.24 volts with factor-of-two steps (.02 × 2^range). If range is greater than 9 the full
scale value used is 10.24 volts. Signal inputs with an absolute value larger than full scale
generate an ADC overflow error.
Range
0
1
2
3
4
5
6
7
8
9
rangePtr contains the current value of the range parameter.
NOTE
If a hpe1437_input_range_auto command is pending or in progress it is aborted
when an hpe1437_input_range or hpe1437_input_range_get command is
received. hpe1437_input_range_get also returns an error if an autorange is
pending or in progress.
coupling specifies the AC or DC coupling mode of the input. Using HPE1437_DC will
connect the input directly to the 50 Ohm buffer amplifier. HPE1437_AC inserts a 0.2
µF capacitor between the input connector and the 50 Ohm buffer amplifier.
couplingPtr contains the current value of the coupling parameter for an E1437 or
group of E1437s.
antiAlias determines whether or not to use the built-in analog anti-alias filter.
HPE1437_ON inserts a sharp-cutoff (11-pole) 8 MHz lowpass filter ahead of the
analog-to-digital converter. Using HPE1437_OFF disables this filter. It is
recommended that you leave the filter on at all times to insure bandlimited, anti-aliased
data.
antiAliasPtr contains the current value of the state parameter.
signal determines whether or not the input signal is sent to the buffer amplifier.
HPE1437_ON attaches the input signal to the 50 Ohm buffer amplifier.
HPE1437_OFF redirects the input signal to a dummy 50 Ohm load, and feeds the
buffer amplifier from an internally grounded 50 Ohm source resistance. The signal OFF
setting is useful for making reference measurements without the signal applied. When
using AC coupling the 0.2 µF capacitor remains between the input connector and its 50
Ohm termination.
signalPtr contains the current value of the signal parameter.
floatIn determines whether or not to allow the outer shield of the input connector to
float relative to chassis ground. Using HPE1437_ON allows the connector to float in
order to reduce potential ground loop induced pick-up at low frequencies. Using
HPE1437_OFF disables floating by attaching the outer shield of the input connector
directly to chassis ground. See the specifications section for more details.
4-38
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Full scale voltage
Full Scale dBm
.02
.04
.08
.16
.32
.64
1.28
2.56
5.12
10.24
-24
-18
-12
-6
0
6
12
18
24
30
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