FINE INSTRUMENTS CORPORATION FINEST 135, User Manual

Press and hold the MIN MAX pushbutton for 2 seconds and

Press 

 MIN MAX pushbutton for 2 seconds and then

then release in 

 to exit RECORD. This Meter 

release   

 to exit RECORD (or HOLD and RECORD

knowledges with a beep 

 and RECORD is no longer

 selected). This Meter acknowledges with a beep 

 and

displayed.

RECORD is no longer displayed.

5.14 Using 

RECORD 

n

n

n

AC

After enabling RECORD. press the MIN MAX pushbutton to
cycle through the MAX, MIN, and AVG readings held in

memory.   this Meter is in CREST (that is, 

 MAX is held in memory. 

 limits the 

of RECORD. The MAX reading is the maximum value 
tected 

 RECORD started. The MIN reading   the 

mum value detected 

 RECORD 

 The AVG

reading   calculated continuously from the 

 of RECORD.

To stop recording and to freeze the values of 

 MIN, and

AVG in memory, press the HOLD pushbutton. Press the MIN
MAX pushbutton to cycle through the readings, including a

 where the 

 blinks. In this mode, readings

may be taken without disturbing the values held in memory.
To restart recording, press the HOLD pushbutton. Then,

RECORD blrnks.

. 

When using HOLD and RECORD, note that when RECORD
is blinking, this Meter is recording values; when 

RECORD

is not blinking, this Meter is not recording values. When

 is blinking, the digital display is showing a real

measurement; when

is not blinking, the digital dis-

play is showing a 

 measurement. HOLD and

RECORD apply   the digital display only. The bar graph

 a real measurement only at all times.

 you press the MIN MAX pushbutton to 

 recording while

in the HOLD mode, RECORD is not blinking 

this

Meter is not recording values. And if you cycle through 

the

MAX. MIN, and AVG readings, this Meter displays just

.

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6. Applications of Measurement

6.1 Non-Linear Loads

True-RMS 

 flow is very impot-tant 

 it directly

relates to the amount of heat dissipated in wiring, 

formers, and 

 connections. Most 

 in the

market measure 

 flow, not true rms 

flow, even if this 

 flow is displayed on a 

calibrated   rms. These 

 are

accurate only for a pure sign-wave 

All 

 waveforms are 

 in some way. The

most common is 

 distortion 

 by non-linear

loads such as household electrical appliances, personal
Computers or 

 controls for motor drives. 

distortion 

 flow at frequencies that

are at odd 

 of the power 

 frequency. 

 flow gives a substantial 

 on the neutral 

of star 

 power distribution Systems.

In most countries a power distribution 

 uses 

mercial 

 power applied to a transformer

with a delta-connected 

 and a star 

 The secondary generally provides 

 AC from

 neutral, and 

 AC from 

 to 

 To

 the loads for 

 was a big headache for

the 

 designer, historically.

The 

 addition of the currents in the transformer’s neutral

wire was zero or quite low 

 was

rarely achieved) in a 

 devices 

nected to 

 were incandescent lighting, 

 motors,

and other devices that presented linear loading. The result

was an essentially sine-wave 

 flow in 

 and

a low neutral 

 flow at a frequency of 

 such as TV 

 fluorescent lighting, 

machines, and microwave ovens are commonly drawing

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