Page 2.3
PROGRAMMABLE RESISTOR MODULES 40-290/291
pickering
SECTION 2 - TECHNICAL DESCRIPTION
R1 IN
0R5
R17
1R0
R18
2R0
R19
4R0
R20
8R0
R21
16R
R22
32R
R23
64R
R24
128R
R25
256R
R26
512R
R27
1K024
R28
2K048
R29
4K096
R30
8K192
R31
16K384
R32
0R5
R33
1R0
R34
2R0
R35
4R0
R36
8R0
R37
16R
R38
32R
R39
64R
R40
128R
R41
256R
R42
512R
R43
1K024
R44
2K048
R45
4K096
R46
8K192
R47
16K384
R48
RLS1
RLS2
RLS3
RLS4
RLS5
RLS6
RLS7
RLS8
RLS9
RLS10
RLS11
RLS12
RLS13
RLS14
RLS15
RLS16
RLS17
RLS18
RLS19
RLS20
RLS21
RLS22
RLS23
RLS24
RLS25
RLS26
RLS27
RLS28
RLS29
RLS30
RLS31
RLS32
R49
LK1
R1 OUT
R50
LK2
R2 IN
R51
LK3
R52
THE 40-290 IS FITTED WITH LINKS 1 AND 3 FORMING 2 SEPARATE 16-BIT RESISTOR CHAINS.
THE RESISTOR VALUES SHOWN IN THE SCHEMATIC ARE STANDARD VALUES; THESE MAY BE CUSTOMISED.
RELAY RL1 SWITCHES R17, RL2 SWITCHES R18, ETC.
ADDRESS 1 COMPRISES RESISTOR CHAINS 1 AND 2. ADDRESS 2 COMPRISES RESISTOR CHAINS 3 AND 4.
THE STANDARD VALUE RESISTOR POWER RATINGS ARE PROVIDED IN THE PARTS LIST IN SECTION 4.
RESISTOR CHAIN 1
RESISTOR CHAIN 2
RESISTOR CHAIN 3
RESISTOR CHAIN 4
R1 IN
R2 IN
R1 OUT
R2 OUT
R2 OUT
Figure 2.2 - Programmable Resistor Module 40-290: Resistor Chain Schematic
These cards support non-volatile storage of a 16-bit calibration value associated with every individual resistor in
each resistor-chain. The Pickering software drivers provide functions allowing the storage and retrieval of these
values, but their interpretation is left entirely to the user’s program.
Pilpxi (Direct I/O) driver functions:
•
PIL_WriteCal
•
PIL_ReadCal
Pipx40 (VISA) driver functions:
•
pipx40_writeCalibration
•
pipx40_readCalibration
These functions are described in the Programming Manual and help files, with some further information in the
Application Notes section on the Pickering Interfaces website www.pickeringtest.com.
