20
Integration time in fast speed: approx. 30 ms;
Integration time in slow speed: approx. 180ms;
So approximate speeds can be calculated:
Fast speed: approx. 15times/sec.
Slow speed: approx. 4.5times/sec.
2.2.7 Clear (Correction)
In order to maintain high measurement accuracy, SHORT and LOAD corrections
for correcting the stray admittance, the residual impedance, and the other
errors can be performed. OPEN clear and SHORT clear are provided by TH2817.
When TH2810B performs OPEN/SHORT correction, all ranges with different
measurement speeds, frequencies, levels are cleared once. And all the clear
parameters are saved in nonvolatile RAM inside the instrument. It’s not
necessary to clear “0” again when restarting instrument. When measurement
environment changes, such as temperature, humidity, test fixture, and space
between down-leads, another OPEN/SHORT correction should be performed.
z
OPEN correction
1.
Press
＜
or
＞
key to select the function of CLEAR;
2.
Press
∧
or
∨
key to select OPEN parameters, and “CLEAr” and “OP” are
displayed. If clear operation is not needed, press
＜
or
＞
key to exit.
3.
Make sure the test terminals are absolutely open.
4.
Press START key to perform open correction. Then, the function item
automatically alters to PARAMETER to exit.
z
SHORT correction
1.
Press
＜
or
＞
key to select the function of CLEAR;
2.
Press
∧
or
∨
key to select SHORT parameters, and “CLEAr” and “SH” are
displayed. If clear operation is not needed, press
＜
or
＞
key to exit.
3.
Use TH26010 short-circuit slice or conducting line of low resistance to make
the test terminals absolutely short.
4.
Press START key to perform short correction. Then, “CLEAR” parameter
alters to “OPEN”, and the function item automatically alters to PARAMETER
to exit.
Note: When performing open or short correction, if the test terminals are not
absolutely open or short as the manual describes, “FAIL” will be displayed in
Display A, and the instrument makes short time alarm, which tells that because
correction fails in this condition, the instrument can’t save all the correction data
and it will exit.
In order to make reliable correction, following rules should be observed:
1. Keep the same condition of the conducting line with that when the correction
is performed;
2.
When short correction is performed, shorting plate supplied by the
instrument or conducting line of low resistance, should be used to make test
terminals short. Don’t directly connect HD and HS, LD and LS. Keep HD and HS,
LD and LS not being directly connected after inserting conducting line of low
