Operating Characteristics - HP LOGIC PULSER 546A Operating And Service Manual

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Model 546A

Page 5

OPERATING CHARACTERISTICS

The HP 546A logic Pulser generates pulses as programmed by a fingertip push-slide switch. The

Pulser is programmed by pushing the switch once for each single pulse output, or a specific number

of times for continuous pulse streams or pulse bursts at selected frequencies. The number of times to

push the switch to select an output mode is labeled adjacent to the switch and is described in Table 2.

On the label a dot (•) represents a push; a dash (-) represents a hold. As shown in Table 2, the pulses

applied to the LED indicators in the tip are slowed down for visibility.

Pressing the switch automatically drives a TTL, DTL, or CMOS logic output or input from LOW to

HIGH or from HIGH to LOW. The high source and sink current capability of the Pulser can override

integrated circuit output points, originally in either the HIGH or LOW state. The nominal10

J.LS

pulse

width is long enough for even slow CMOS circuits to accept, but heavy circuit loads (such as TTL

drivers) result in narrower pulses that limit the amount of energy delivered to the device under test.

The Pulser's output is three-state. In the off-state, the probe's high output impedance ensures that

circuit operation is unaffected by probing until the Pulser switch is pressed. Pulses can be injected

while the circuit is operating and no disconnections are needed. The multi-pin stimulus kit (Figure 2)

is useful for stimulating up to four inputs of a gate at the same time, or for stimulating four different

circuit nodes.

The Pulser's power input and output (tip) circuits are protected against overvoltage and reverse

polarity.

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