Here we review two Time Electronics Ltd. DC Millivolt Source calibration units. They use a precision reference zener diode, low temperature coefficient resistors and thumb switches to select a precise voltage accurate to 1 Micro Volt. They have 3 ranges and an accuracy of ± 0.05%.
Fluke 8842A Digital Multimeter Review & Teardown
A closer look at a Fluke 8842A Precision Multimeter and teardown. Manufactured in the 1990’s and had an accuracy on the D.C. ranges of up to ±0.003%. A very high quality meter.
Precision Voltage Reference Modules
Review and teardown of 3 types of Precision Voltage Reference Modules which are useful for checking the calibration of Digital Multimeters.
Keithley 178 Multimeter teardown
Teardown of a Keithley 178 Digital Multimeter manufactured in 1979. This multimeter was one of a number at that time which used the Intersil ICL7103A and ICL8052A chip set which simplified multimeter design and manufacture.
Keithley 168 Multimeter teardown
The Keithley 168 autoranging digital multimeter. Manufactured in the early 1970’s. Used the 74360N multimeter chip which is now obsolete. D.C. voltage range from 0.1mV to 1000V. A.C. voltage from 0.1mV to 500V. Current ranges from 0.0001mA to 1A. Ohms from 0.1 ohm to 20 mega ohm. Input resistance is 10 mega ohm.
Thurlby 1905A Intelligent Digital Multimeter Review & Teardown
Review and teardown of the Thurlby 1905A Intelligent Digital Multimeter was designed and manufactured in the 1980’s by Thurlby Electronics Ltd. The meter is a 5½ digital manual ranging multimeter with keyboard programmable computing and data logging facilities. The basic accuracy is ±0.015% on the D.C. ranges.
Datron 1065 Autocal Digital Multimeter Review & Teardown
Datron 1065 Autocal Digital Multimeter review and teardown.
Muirhead D825G Decade Resistance Box Review & Teardown
Muirhead D-825-G Decade Resistance Box review, teardown and calibration check. Now 50 year old but still in calibration tolerance.
Keithley 175A Multimeter Review & Teardown
Review and teardown of a Keithley 175A Autoranging Multimeter with details on how to use the Data Logger feature. Also a full explanation of the internal PCB and main components.
IMAX B6AC genuine viz fake – Review & Teardown
IMAX B6AC balanced charger genuine viz fake