Svantek SV 977D User Manual

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SV 977D User Manual - Appendixes
2. I/O Mode: Analog In – future feature.
3. I/O Mode: Digital In. When the Ext. Trigger function is activated, the external triggering of the instrument
may be provided. To do that the user should select Trigger: External (path: <Menu>
/ Measurement / Measurement Trigger). The external signal for triggering is specified as follows:
a) Trigger voltage threshold level is set to +1 V.
b) Trigger voltage slope (path: <Menu> / Measurement / Measurement Trigger) set by the user as
Slope [+] (uprising as default) or Slope [–] (falling, auxiliary).
c) Minimal duration of the trigger impulse: 10 μsec.
d) 100 μsec. release time after previous measurement is necessary before next trigger.
e) Recommended trigger voltage should not exceed ± 5 V.
f) Input impedance in the Digital In mode – ca. 10 kΩ / 100 pF, ESD type safety.
g) When the instrument is switched-off in the Digital In mode, the voltage impulse on the pin [1] will
be able to switch-on the instrument, however in this case the minimal duration of the trigger
impulse of 100 msec is necessary, with uprising voltage slope.
4. I/O Mode: Digital Out. Two different functions are available in this mode:
4.1. Function: Trigger Pulse. When this function is selected, the terminal [1] is set as output, which
enables one to trigger another instrument (one instrument or more with trigger inputs connected
together in parallel), output trigger impulse meets specification given below:
a) trigger impulse is generated before every measurement,
b) output voltage range from 0 V or 3 V,
c) triggering slope: rising or falling,
d) output impedance: 51 Ω,
e) duration of the impulse: ca. 30 μsec.
4.2. Function: Alarm Pulse. When this function is selected, the terminal [1] is set as an output, which
changes its output level, when current result of measurement exceeds user-programmable threshold
level. In this case the terminal [1] output operates as an output of analogue comparator with user-
programmable threshold. This feature enables one to control an external device as alarm-indicator or
similar:
a) electrical specification of this output are as follows: 0 V to 3 V voltage range, 51 Ω output
impedance,
b) output produces a voltage level (not impulse),
c) Active Level setting may be selected by the user in menu as Low or High. When High is
selected, the output alternates from 0 V to 3 V till measurement result is greater than
threshold value,
d) Source setting selects source of measurement result to be compared with the threshold
value. One of three results sources may be selected Leq(1), Peak(1), Max(1), Spl(1),
e) Source Type setting selects Current or Periodic, according to last result became of
settled Integr. Period (path: <Menu> / Measurement / General Settings),
f) Level enables setting-up the threshold value.
Real Time Clock
Built-in real time. Accuracy better than 1 minute/month. Additional built-in CR1220 battery provides power to
the RTC for a minimum of 2 years (typically 10 years).

Svantek SV 977D Specifications

General

Brand	Svantek
Model	SV 977D
Category	Measuring Instruments
Language	English