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IM 701210-05E
Making Preparations for Measurements
3
3.14 Connecting the Earphone Microphone with a
PUSH Switch and Connecting the Speaker
The optional earphone microphone with a PUSH switch (701951) must be connected to
use the voice memo function (see section 7.9) and voice comment function (section
13.19). The recorded voice memo and voice comment can be played through an
external speaker by using an optional speaker cable (701952) that is sold separately.
Connecting the Earphone Microphone with a PUSH Switch (701951)
Insert the φ2.5 plug of the earphone microphone with a PUSH switch to the VOICE IN/
OUT/SW terminal of the DL750/DL750P left side panel.
REC LEVEL knob
Adjusts the recording level of voice
memos and voice comments.
Set to the center position (clicks in
place) for an adequate recording level.
VOLUME knob
Adjusts the play volume of voice
memos and voice comments. Set to
the center position (clicks in place)
for an adequate play volume.
VOICE IN/OUT/SW terminal
Connect the earphone microphone
with a PUSH switch here.
PUSH switch
Microphone
Earphone
Cord clip
Higher
Lower
Higher
Lower
Specifications of the Earphone Microphone with a PUSH Switch
Dynamic Inner Earphone
Input impedance: 32 Ω
Frequency range: 100 to 20 kHz
Maximum input: 40 mW
Electric Condenser Microphone
Output impedance: 1.6 kΩ
Frequency characteristics: 100 to 10 kHz
Directional characteristics: Omnidirectional
Code: 1.2 m, φ2.5, with 4-pin plug
Weight: Approx. 16 g
Earphone Microphone Jack Input/Output
Jack: 4-pin jack
Microphone input: Electric condenser microphone, input impedance of approx. 5 kΩ
Earphone output: Dynamic, impedance of 32 Ω
Switch input: 10-kΩ pull-up (3.3 V)
Note
• The specifications above apply to the optional earphone microphone with a PUSH switch
(701951) that is sold separately. Operation of other earphone microphones are not
guaranteed.
• There is no protection circuit, because it is a dedicated input. Be sure to use the
dedicated earphone microphone by YOKOGAWA.
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