Table of Contents
Advertisement
Model 35601A
Appendix A
APPENDIX A
Operating the -hp- 35601A Locally
This appendix outlines the procedure for controlling the state of the -hp-35601 A using the
switches on the Al board. Normally, the easiest way to control the -hp-35601A is with a
computer and the program "SWITCH" (see Section V). In the case where the handshake
circuitry of the Al board is not working, or computer is not available, the 35601A may skill
be controlled in the following manner:
• Set switch SW1 to the LOCAL position (closed). SW1 must remain in this position while
controlling the 35601A in the local mode.
• Set switch SW3, bit 8 to the 0 position (closed). With bit 8 in this position, bits 1 through
7 of SW3 determine the latch selected when SW2 is switched to the load position and back.
See Table A-1 following this discussion for the states of bits 1 through 7 necessary to select a
particular latch.
• After the latch has been selected, set switch SW3 bit 8 to the 1 position (open). With bit 8
in this position, bits 1 through 7 of SW3 determine the states of the bits in the latch selected
in the previous step, when SW2 is switched to the load position and back. See Table A-1
following this discussion for the function of each bit in the latch. This may be a difficult step
x
because in order to change only one bit in a latch, the previous states of the other six bits
must be entered in addition to the state of the changed bit. In other words, it is impossible to
enter the state of only one bit in a latch; the states for all bits in a latch must be entered.
Note that in the turn-on state of the 35601 A, the output of each latch bit is zero. These states
correspond to the switch positions shown in the block diagrams in Section VI and in Figure
A-1. The states of the switches and relays (K's, S's, & L's) may be changed from those in the
block diagrams by loading the appropriate latch number and latch bits as shown in Table
A-1. The absolute DAC voltage is programmed with eight separate bits (0 through 7). The
sign of the DAC voltage is programmed either positively or negatively by setting high the ap
propriate bit. The remaining bits set the gains, attenuations, and lead/lag number. Again,
the turn-on states for all these bits are zero.
A-1
Advertisement
Table of Contents
