Tektronix 305 DMM User Manual

CH2 (in); The signal connected to the CH2 INPUT con
nector is the trigger signal.
EXT (External Trigger) (CHI and CH2 push buttons
out): Signal connected to the EXT TRIG INPUT connector
is the trigger signal.
27. Slope-Push button switch selects either the positive
going or negative going slope of the trigger signal.
+ (out): Sweep triggers on the positive-going portion of
the trigger signal.
- (ini: Sweep triggers on the negative-going portion of
the trigger signal.
28. Coupling -Push button switch selects method of
coupling the signal to the trigger generator circuit.
AC (out): Rejects dc and attenuates signals below about
60 Hz. Accepts signals from about 60 Hz to 5 MHz.
OC (in): Provides direct coupling for signals within the
vertical bandpass (dc to about 5 MHz).
29. TRIGGER LEVEL—Selects the amplitude point on
the triggering signal at which sweep is triggered. It is usually
adjusted after Trigger Source, Coupling and Slope have
been selected.
30. T T L -ln conjunction with TTL positions of the
CH1/CH2 VOLTS/DIV switch, presets the trigger for a
stable display from an input TTL source. Trigger Coupling
must be in DC and Mode switch in the NORM position.
31. Trigger Mode-Push-button switch that determines
the operating mode of the trigger circuit.
AUTO (Automatic) (in): Sweep is triggered when a
signal with sufficient amplitude and a repetition rate of at
least 200 Hz (to 5 MHz) is applied to the vertical system.
In the absence of an adequate signal, sweep free-runs to
produce a reference display trace.
NORM (Normal) (out): Sweep is initialized if the follow
ing circuit conditions are met: TRIGGER LEVEL set cor
rectly .sufficient signal amplitude applied to vertical system;
input signal frequency within the vertical bandpass limits
when Coupling is in the DC position, or signal frequency is
between 60 Hz to 5 MHz in AC Coupling mode. In the ab
sence of an adequate trigger signal or when trigger controls
are misadjusted, there is no sweep or trace.
305 Operators
13

Tektronix 305 DMM Specifications

General

DC Voltage Ranges	200 mV, 2 V, 20 V, 200 V, 1000 V
Diode Test	Yes
Continuity Test	Yes
Input Impedance	10 MΩ
Power Supply	9 V battery
Type	Digital Multimeter
Display	3.5 digit LCD
AC Voltage Ranges	200 V, 750 V
DC Current Ranges	20 mA, 200 mA, 10 A
Resistance Ranges	200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ

Summary

GENERAL INFORMATION

SAFETY INFORMATION

Guidelines to ensure safe operation and protect the operator.

OPERATING VOLTAGE

Information on power sources for the instrument's operation.

AC POWER SOURCE OPERATION

INTERNAL BATTERY OPERATION

CONTROLS AND CONNECTORS

POWER SOURCE AND CONNECTORS

APPLICATION AND MEASUREMENTS

DC VOLTAGE MEASUREMENT

Procedures for measuring DC voltage using the digital multimeter.

AC VOLTAGE MEASUREMENT

RESISTANCE MEASUREMENT

INSTANTANEOUS AMPLITUDE MEASUREMENT-DC

Measuring the amplitude of any point on a waveform with respect to ground.

PEAK-TO-PEAK AMPLITUDE MEASUREMENT-AC

Measuring the peak-to-peak amplitude of a signal using the oscilloscope.

VOLTAGE COMPARISON MEASUREMENTS

TIME DURATION AND FREQUENCY MEASUREMENT

Measuring time duration and calculating frequency of signals.

TIME DIFFERENCE MEASUREMENT

Measuring time difference between two pulse waveforms from different sources.

DUAL TRACE PHASE DIFFERENCE MEASUREMENTS

Comparing phase between two signals of the same frequency.

HIGH RESOLUTION PHASE DIFFERENCE MEASUREMENT

Improving accuracy for phase differences less than 45 degrees.

RISE TIME MEASUREMENT

Measuring the time it takes for a signal to rise from 10% to 90%.

COMMON MODE REJECTION

SPECIFICATION

ELECTRICAL CHARACTERISTICS

Performance requirements for electrical characteristics.