Universal Remote User Manual

Programming the VT1422A & VT1529A/B for Remote Strain Measurement 75Chapter 3

Dynamic Strain Port

Offset Control

Each buffered dynamic strain channel includes an offset adjusting DAC

controlled by the command

SOURce:VOLTage[:AMPLitude] <-offset_v>,(@<ch_list>)

Reducing the unstrained bridge offset voltage at the dynamic strain port

channel can allow the VT1432A to measure the channel using a more

sensitive range. See Figure 3-14 for the offset DAC arrangement.

To reduce the offset voltage at each dynamic strain "Buffered Output"

channel:

1. Measure an unstrained Buffered Output channel with a

VT1432A/33B and place the value in a variable arbitrarily called

<offset_v>.

2. Send minus <offset_v> to that channel with the SOUR:VOLT

command. For example: SOUR:VOLT <-offset_v>,(@10000)

Note With a 13 mV resolution, the offset DAC can reduce the Buffered Output

channel offset to within a few millivolts of zero.

Figure 3-14. Dynamic Strain Offset DAC

Buffer

To VT1422A

(VT1539A SCP)

hannel Bu

RJ-45

2:1

Mux

Cal-

Cal+

Optional

Filter

2,10,100Hz

Instrument.

Amplifier

Dynamic

train

Buffered Output

32:1

Mux

CH31

CH01

CH00

X16

8-bit offset

DAC

SOURce:VOLTage