Daytronic Corporation - System 10 - A-Sized Diagnostic Cards

By bringing the appropriate slot connections out the front of the mainframe, the Model 10AEX-20 lets you operate any System 10 "A Card" outside its designated "A Slot."

It thus permits direct access to all of the card's "on-board" hardware, while at the same time maintaining any and all of the card's rear connections (to transducer, contact closures, other system cards, etc.). The Extender Board may thus be used for purposes of signal tracing, waveform observation, adjustment of internal controls, or various other diagnostic or service functions.

Installed in any unoccupied System 10 "A Slot," this card lets the system read and display all pertinent power and reference voltages. It has its own independent temperature-stabilized reference source to verify the accuracy of all measurements.

The 10AHM's eight diagnostic "subchannels" are listed in the table below. Each subchannel can be dedicated to an otherwise unused system data channel. It can than be scaled and filtered like any analog data channel, and can be continuously and automatically monitored for conformance to specific limit values.

The companion Model 10BDHM is a "B-sized" card which, when connected to the 10AHM via a special cable, can be used to monitor B-Deck voltage supplies, plus critical software handshake lines and other dynamic signals. If the 10BDHM is used along with the 10AHM, there will be 21 subchannels in all. Click here for a list of 10BDHM subchannels (Nos. 9 through 21).

Model 10AHM Subchannels
No. 1	Measures various voltages referenced to Signal Common with a clip lead. May be used to troubleshoot cards in conjunction with the Model 10AST Analog Slot Test Card.
No. 2	An on-board +2.5000-V reference, temperature-stabilized in its own oven. Used to track the gain drift, if any, of the A/D and its amplifier.
No. 3	Measures the amplitude of the system AC Reference, which controls the excitation levels for LVDT and AC strain gage cards. Its frequency (3276.9 Hz) also provides sync for a variety of cards.
No. 4	Measures the system DC Reference. Since System 10 is ratiometric, this should always read 5.000 � 0.001 V. Deviations indicate trouble with the mainframe's Model 10BIP232 RS232 Interface Card.
Nos. 5 and 6	Measure the �9-volt supplies, which are factory-set to �8.90 V. Normal loading effects should not result in more than 0.3-V drop.
No. 7	Measures the local (A-Deck) SIGNAL COMMON. Large deviations from 0 indicate excessive current, and thus possible faulty modules on the A Deck. Faulty input wiring can occasionally cause this also.
No. 8	Measures the local (A-Deck) POWER COMMON. As with Signal Common, large deviations from 9 indicate excessive current, and thus possible faulty modules on the A Deck. Faulty input wiring can occasionally cause this also.

The 10AST is a special diagnostic and service tool. Plugging into the Slot Connector of any mainframe "A Slot," its front section protrudes from the slot. Through an array of labeled terminal posts, it thus allows voltmeter or oscilloscope observation of power and reference voltages, logic and calibration signals, data-bus lines, and all other signals pertinent to the slot in question.

The 10AST also lets the system read and display the slot's Signal Common, Power Common, DC Reference, Input Signals, and �9 VDC Power Supply levels, as it would any standard System 10 data channels.

This card supplies two channels of regulated, sensed �12 VDC, �2% power (up to 20 mA) for excitation of external transducers. Though most often used to power high-output DC-to-DC LVDT's, it may also be used with other transducers within this voltage and current range.