Documents for repairing Wavetek 143 Function generator

TiRe · Guest

Hello,

can somebody help me with schematic, manual for repairing Wavetek 143 Function generator?

Thanks!

Timo

nixie · Guest

Hi,

I just bought a non-working 143 on ebay. Just wondering if you ever found the manual. If not, maybe we can share info anyway.

Best wishes,

Bob

r l g r i e b at att dot net

Guest · Posted: Fri Mar 02, 2012 2:57 am Post subject:

The manual for the 145 is available on the web for free. Turns out that the 145 is very similar to the 143, but has the added pulse output circuitry.
I think the main board and power supply bds are the same and the schematics and parts lists are in the manual. My unit has a fried output transistor. This must have been a common failure as the 145 added a separate current-limiter pc bd to the unit, which is very simple. I plan to add
this to my unit as well, to protect the output transistors from frying.

Many of the schematics in the manual say 143/145 on them.

Bob

kenif · Guest

My outputs were fried.
I disconnected the output and replaced with an OPA547.
Cheat to win Smile

Guest · Posted: Mon Sep 22, 2014 6:09 pm Post subject:

But you've converted your 20MHz generator into a 1MHz generator.
OPA547 slew rate is 6V/us, while the Wavetek 145 spec is 20ns at 15Vp-p. The original output transistors are 500MHz parts.

Dave Wise

shipmark33 · Joined: 01 Oct 2014 Posts: 1

This must have been a common failure as the 145 added a separate current-limiter pc bd to the unit, which is very simple. I plan to add
this to my unit as well, to protect the output transistors from frying.
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