HP E42 manual Troubleshooting Input Channels, 10.A12 Relay Operation, Relay Control Logic

Model 5328A

Maintenance

5 - 43 . TROUBLESHOOTING INPUT CHANNELS

5-44. The main function of the input channels is to perform input signal conditioning via either local or remote control, Therefore, effective problem diagnosis is divided into two sections, local and remote. It is most efficient to assure proper local operation before remote section trouble- shooting is performed. Use of the Performance Test (Table 5-4)will aid in determining which troubleshooting section to use.

5-45.Local Mode Troubleshooting

5-46. Local Mode Troubleshooting consists of the troubleshooting flowchart in Figure 5-5.These flowcharts are intended to help isolate local operation problems.

5-47. The flowchart in Figure 5-5is intended for overall local operation troubleshooting. Table 5-10 Relay Operation shows required levels, control lines, and the relay involved for any func- tion. Table 5-11Relay Control Logic shows the output line and level required for proper relay operation in a function. These tables, 5-10 and 5-11, are to be used with the Local Mode Trouble- shooting Flowchart (Figure 5-5).

5-48. The programming interface section of the A10 Synchronizer board is used only when the 5328A is in remote. The interface is used in conjunction with the All board to control A and B channel signal conditioning. When the 5328A is in remote, addressable latches, U8 and U15, con- trol all of the signal conditioning relays. The A11 DAC board is also used in remote to allow pro- gramming of the A and B channel trigger levels.

Table 5-10.A12 Relay Operation

J-1 Pin #		Function		J-1 PIN		Relay Controlled
			HI		LO
2		Channel A Slope	—		+	———
5		Channel B Slope	—		+	———
6		Channel B Atten	X1		X10	K6, K11, K10
7		Channel B Coupling	DC		AC	K9
10		SEP/COM	COM		SEP	K4, K5
12		Channel A Atten	X1		X10	K2, K3, K8
14		Channel A Coupling	DC		AC	K7
	NOTE: Nongrounded pins on J-1 should float to TTL high.

Table 5–11.Relay Control Logic

Function	Channel A		Channel B
Slope +	A10J3 Pin 2 Low		A10J3 Pin 5 Low
	A10 J3 Pin 2 High		A10J3 Pin 5 High
X1	A10J3 Pin	12 High	A10J3 Pin 6 High
Attn X10	A10J3 Pin 12 Low		A10J3 Pin 6 Low
X100	A10J3 Pin	13 High	A10J3 Pin 8 High
Coupling	A10J3 Pin	14 Low	A10J3 Pin 7 Low
	A10J3 Pin	14 High	A10J3 Pin 7 High
SEP, COM A	SEP A10J3 Pin 10 Low
	COM A A10J3 Pin 10 High

5-49. Remote Mode Troubleshooting

5-50. The following information includes Programming Logic Troubleshooting and DAC Troubleshooting. These areas will help isolate remote operation problems where A and B input channels operate correctly in local control.

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